org.slf4j.helpers.ThreadLocalMapOfStacks Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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package org.slf4j.helpers;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.HashMap;
import java.util.Map;
/**
* A simple implementation of ThreadLocal backed Map containing values of type
* Deque.
*
* @author Ceki Guuml;cü
* @since 2.0.0
*/
public class ThreadLocalMapOfStacks {
// BEWARE: Keys or values placed in a ThreadLocal should not be of a type/class
// not included in the JDK. See also https://jira.qos.ch/browse/LOGBACK-450
final ThreadLocal>> tlMapOfStacks = new ThreadLocal<>();
public void pushByKey(String key, String value) {
if (key == null)
return;
Map> map = tlMapOfStacks.get();
if (map == null) {
map = new HashMap<>();
tlMapOfStacks.set(map);
}
Deque deque = map.get(key);
if (deque == null) {
deque = new ArrayDeque<>();
}
deque.push(value);
map.put(key, deque);
}
public String popByKey(String key) {
if (key == null)
return null;
Map> map = tlMapOfStacks.get();
if (map == null)
return null;
Deque deque = map.get(key);
if (deque == null)
return null;
return deque.pop();
}
public Deque getCopyOfDequeByKey(String key) {
if (key == null)
return null;
Map> map = tlMapOfStacks.get();
if (map == null)
return null;
Deque deque = map.get(key);
if (deque == null)
return null;
return new ArrayDeque(deque);
}
/**
* Clear the deque(stack) referenced by 'key'.
*
* @param key identifies the stack
*
* @since 2.0.0
*/
public void clearDequeByKey(String key) {
if (key == null)
return;
Map> map = tlMapOfStacks.get();
if (map == null)
return;
Deque deque = map.get(key);
if (deque == null)
return;
deque.clear();
}
}